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lenovo ideapad 3-14 salc Ryzen2021 Version laptop bios unlocked?

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Hi everyone,
I bought a lenovo ideapad 3-14 salc laptop a week ago(AMD R-5-5500U,Vega 6,Phoenix bios type,1.8V 16MB 128Mbit dip-8 bios chip). I want to use the advanced options and legacy boot support in the bios settings. It is said that this requires unlocking the bios files. I don’t know what to do, can you help me? 


my laptop bios file backup(used Minpro-1 programmer,all support 3.3V and 1.8V bios chip):https://mega.nz/file/R2IFiI6K#w1rcC-_d5cyVeFEvvPHLvVCdqw2ci9SsDtMacc7q6Bg


my laptop bios file (Lenovo official):https://mega.nz/file/pvgTTKTC#IL6vJNVJknLhHUrQd-UjYlEI9gEjn5Jq9wC2KY60gYs





In addition, I also thought of some methods myself, such as using the tools in the link below:

GitHub - datasone/grub-mod-setup_var: A modified grub allowing tweaking hidden BIOS settings.


I tried to use this tool to modify the bios hidden settings,It seems to be able to open the “csm support” option.In the end, I still failed, There is no legacy boot item in the bootmenu (press F12 when starting), and I can’t start from uefi mode after the modification, I can only use the Minpro-1 programmer flashing back to the backup bios file,The computer was saved.


Finally, I also found a tool:

https://mega.nz/file/F64jlKrI#DnSi7uI3x0wAzUvsCbXhV9JpWEGpAqL8z0AttMj1QBw(chaboot Ver216,Lenovo official):

When I used this tool, the options of uefi and legacy options appeard in bios,But it didn’t seem to have any practical effect.



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